I thought I'd try and find out something about M21+, so I searched for the original Underhill paper people have cited and found it online: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC310671/ The trouble is, the table that lists the "Description of Y Markers Used in Haplotype Construction," which must be where the information is because it isn't anywhere else in the paper that I can see, is a teeny little gif file that does not offer up a readable image when you click it. No point in just enlarging the gif, it's unreadable when enlarged. Does anyone know of a readable copy? Or does anyone know what I'm looking for? I'd like to know the geographic location/origin of the test subject. How many of those who tested M21 had any prospect of actually being positive? Diana